Ill. Admin. Code tit. 44, § 40.620
f) In addition to the annual confirmation, CMS may require confirmation of eligibility at any time during the term of certification.
(Recodified from Section 20.620 of 44 Ill. Adm. Code 20 (Central Management Services) pursuant to Section 45-57 of the Illinois Procurement Code [30 ILCS 500/45-57], at 47 Ill. Reg. 12484)